Page 64 - 《水资源与水工程学报》2023年第2期
P. 64

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                 sinsshowedasignificantlydecreasingtrend,butthemeanannualrunoffdepthoftheYR(69.34mm)
                 wasgreaterthanthatoftheXJ(39.07mm),whichdecreasedatarateof13.0mm/10aand8.7
                 mm/10a,respectively;themonthlyandseasonalrunoffdepthalsodecreasedsignificantly,especiallyin
                 summer.Anabruptchangewasobservedin1981and1979intheXJandYR ,respectively,aftertheab
                 ruptchangethedecreaserateoftherunoffdepthsloweddown,andthefrequencyofextremerunoffde
                 creased,withthelargestdeclineofrunoffspottedinAugust.Themainperiodsofrunoffdepthwere15,
                8,5aintheXJand16,10,5aintheYR.Additionally,therewerefiveperiodsofdryandwetatthe
                 timescaleofthefirstprincipalperiod.Theresultsofthecorrelationanalysisandrandomforestmodelin
                 dicatedthatprecipitationwasthedominantfactoraffectingthelongtermrunoffchanges ,especiallyinthe
                 floodseason,whereasleafareaindexwasanotherimportantfactoraffectingtherunoffchangesinthenon
                 floodseason.
                 Keywords:runoffdepth;random forestmodel;influencingfactor;theXiaojueRiverBasin;theYe
                 RiverBasin;themountainousHutuoRiverBasin
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